Carbureter.



W. W. MUIR.

GARBURETER.

APPLIOATION FILED JUNI: 14.1912.

Pateted Nov. 11,1913'.

28. The arm 31 is provided with a spring 39 attached to a regulating screw d0, -the latter being connected by means of the universal joint l1 with a handle on the dash 5 of the vehicle (not shown). By turning the member 10, the tension of the spring 3i) may7 be adjusted.

Referring new again to Fig. 3, it will be seen that near the end of the shaft Q6 is a 10 collar A frame t3 (see Fig. ll) is secured to this collar by means of a bolt 4e. This frame bears a cross piece 45 upon which is mounted a set screw 46. A second cross piece t7 bears a set screw d8. Between the side members of the frame 4.3 is pivoted a. cam member 49, provided with a` bearing portion 49 arranged to enter the slot 14 of t-he head 14d and to bear on the ball l5. Between the collar 42 and the upper side of the cam member 49 is a spring 50, which bears on the cam member e9 as shown in Fig. 4, a spring 51, bearing on the shaft or rod 26, both of these sprmgs 50 andfl hav' ing their ends disposed in a recess 52 in the cam member '49, as shown in Fig. 4.

F rom the foregoing description of the various parts of the device, the operation thereof may be readily understood.

When the throttle or valve 19 .is open, the

,{rsuction from the engine Willbegin to draw in air through the passage 11. The valve 14e is slightly open and the fuel will therefore be sucked up by the air and will be atomized and carried along with it into the engine .5 cylinder. It will be observed that there is no necessity of throttling or priming the carbureter, but that the valve 14 is in position to cause an immediate comminghng of the fuel and air when the engine irst starts. Now when the suction becomes greater, the air Will' be drawn in with more force, but presently, due to the restricted passage 1l, the suction \vill overcome the tension of the spring 27, and the pressure of the air on the outside will force open the.

valve so as to allow the air to pass through the by-pass 20. The movement if the valve,

however, will cause a movement of the frame,

and owing to the inclination of the cam member with respect to the rod 14h, the latter will be forced upwardly by the spring 17 as the cam member is moved t'o the right in Fig. 8, thus opening the Ifuel passage and permitting more fudl to enter.

Now the throttle 19 is on the shaft 29, and the latter is actuated by the arm .33, which in turn is controlled by the link 54 leading to the throttle lever (not shown). In opening the valve, the arm 53 is shifted from the full line position to the dotted line position, shown in Fig. 1. he segment 30 is likewise shifted and permits the arm 31 to take the dotted line position, shown in Fig. 1, under the influence of the spring e5 27, which pushes the collar 2S of the cam member before it, thus rotating the siaft 32 and the arm 231. The tension therefore of the spring Q7 is released the farther the throttle is opened, and therefore a greater amount of air will enter through the bypass 2O and a greater amount. of fuel will be permitted to flow past Athe valve A, since the latter is moved outwardly as the valve 21 is moved inwardly. The collar 55 on the rod 2G prevents the valve from movingunduly by its engagement ywith the sliding collar 2S.

The rate at which the fuel inlet valve 14C is opened is dependent upon the inclination of the cam surface 49a. This may he regulated by the thumb screws 1G and 48, for it will be apparent that if the screw e8 is turned, the cam member 49 will be swung ou its pivot in one direction, or the other according to the tightening or loosening of the screw. The whole frame 43 may be adjusted by means of the screw 116. Thus a proper portion of fuel may y'he admitted with a given movement of the. valve 21.

I desire to call particular attention to the fact that this carbureter d iers from those in which there is' a bypas's for the admis sion of air when the engine is running fast but where no provision has been madegfor a corresponding increase of the fuel flow,` as in the present invention, while the fuel is carried upwardly by the rush of air through the passage 1l. The amount of fuel nevertheless is dependent not only upon the rush of air through the passave 11, but is dependent upon and proportiona 2to the amount drawn in through the by-pass. The result. is Athat at all times the amountnef fuel supplied to the engine is in proportion to the amount of work the engine is doing, and this reguf lation of the fuel supply i maintained automatically under all conditions. Y

In Fig-5, I have shown a modified form ot' the cam member 49. "it may be that at times itis desirable to hav'ea greater proportion of fuel admitted than at other times. ln other words, instead of having an amount which is in proportion to the opening of the throttle, it may be best to have varying amounts, or a greater proportional amount in one position of the throttle, than in other positions. To this end I may malte the bearing surface of the cam member 49 of a curved form, as shown at 19 in Fig. 5. Thus there will be a greater throw of the valve rod 1l" in certainy positions of the cam 4&9 than in others.

l claimiw 1. ln a carbureter, a main air passage haring a restricted portion, a fuel inlet terminating near said restricted portion, a valve for said fuel inlet., a valve stem for said valve, a cam member arranged to be engaged by the end of said valve stem, means for holding the stein in operative re- A valve for said ful saranno lation with the cam, an auniliary air inlet opening, a Valve for said air inlet opening, a rod eonneoted with said last named valve, an outlet passage for the explosive gases, a throttle iu said outlet, inea-ns for operating the throttle, a' springY for normally holding the valve of the auxiliary air inlet closed, and means operated by the throttle opening mechanism for decreasing the 'tension of the spring, said cani member being car ried hy said rod. i

2. lna carburetor, a main air passage having' a restrieie portion, a fuel inlet terminating' near s: l' restricted portion, a fr inlet, a valve stern for said valve, a cani rnemher arranged to be engaged by the end of said Valve stem, means for holding the stern in operative relation with the cam, an auxiliary air inlet opening, a Valve for said air inlet opening, a rod connected with said last named Valve, an outlet passage for the explosive gases, a throttle in said outlet, nieans'ilor operating the throttle, a' spring for normally holding the valve ofthe auxiliary air inlet closed, means operated hy the throttle open insr mechanism for decreasing the tension of the spring, said means coniprising,V an arcshaped cani memher secured to the throttle shaft, a rocir shaft, an arm secured to saidv rook shaft, and arranged to hear on said 'arclshaped cam member, another arm earried by said rock shaft, a slidable collar on said 'rod arranged to be engaged by the second arm, one end ofthe spring for the auxiliary air inlet valve being arranged to bear on said slidable collar, said first named cani being mounted on said rod.

ln a carburetor, a main air passage, an auxiliary air passage, a fuelv inlet in said main air passage, a valve for said auxiliary air passage, a valve for said ,fuel'inleu means connected with the valve in said auxiliary air passi fe for controlling the movement of thevalve in. said fuel inlet, a spring tending to hold the valve of the auxiliary air passage closed, a throttle, means for oper-` Vating;l said throttle, and inleans controlled hy the throttle operating means for varying the tension of ,said spring'.-

l. ln'a carbureter, a niainair passage, an auxiliary air passage, a fuel inlet in said main air passage, a valve for said auxiliary air passage, a valve :for said fuel inlet, means connected with the valve in said auX- iliary air passage for eontrolliiug the moyenient of the valve in said fuel inlet a spring, tending` to hold the valve of the auxiliary air passage closed, a throttle, means for operating said throttle, means controlled hy `the vthrottle operating means for varying; the

tension of said spring, said means comprising a :ani member secured to the throttle shaft, an arm anfanged .to beengaged by said cam member, a"rock shaft secured to said arm, and another arm carried by said rook shaft and engaging the' spring'at theend thereof remote from the valve to con trol its tension. f

5. ln a carhureter, a main air passage, an auxiliary air passage, a fuel inlet iii-said mainair passage, a -valve for said auxiliary air passage, a Valve for said fuel inlet, means connected with the valve in said aua:- iliary air passage for controlling the' movement of the valve in .said fuel inlet, a springr tendingv to hold the Valve of the auxiliary air passage closed, a throttle, means for operating said., throttle, means controlled by the throttle operatingn means for varyii'ig,r the tension of said spring, said means coin-- prising; a cani member secured to the throttle shaft, an arm arranged to be engaged by said cam member, a rock shaft secured to said arm, an arm carried by said rook shaft, anda slidable member arranged to be engaged ley-said arm, a guide for said inember, said spring being arranged to hear on said slidable member.

(i. In a carburetor, a constant air passage, an auxiliary air passage and an outlet pas sag-c intowliich both the other passages discharge, a throttle valve in the outlet, a fuel nozale in the constant air passage, a Valve in the auxiliary airpassage, aspring bending.;1 to maintain the air valve closed, means connected to the throttle for reducing the tension of the spritzig, at full open throttle,

iliary air passage and an outlet passage into which both said passages discharge, a throttle vali/ein the outlet, a fuel nozzle in 'the constant air passage, a Valve in the auir-Y i iliary air passage opening inward, a spring' tending to maintain the air valve closed, an abutment for the spring and means con nected to the throttle for moving the abut ment and reducing the tension of the spring at full open throttle, and positive means also connected to the throttle and engaging the abutment to limit the throw of the valve.

8. In a earhureter a constant air passage,

an auxiliary air passage and an outlet pasu sage into Which both the other passages diseharge, a throttle valve in the outlet, a fuel nozzlein the constant air passage, a valve in the auxiliary air passage, a spring tending to maintain the air valve closed, means eonneeted to the throttle for reducing the tension of the sprint/j at open throttle, and means also connected with the throttle for positively limiting the {iow of the auxil lary air valve, said means being controlled by the throttle to increase the possible opening of the air valve as the throttle Valve is opened, a fuel valve, operating meanrthere- Ill for, and means eonnecting the said operating means directly to the air Valve so that the fuel valve is controlled by the suction.

9. -In a carbureter, the combination with a normally automatically closed fluid pres .sure actuated air inlet valve having a stem projecting from the Valve housing, a Valve controlling the supply of fuel to said housing and having a stem projecting from the latter, of a carn-1nember on the air-inlet valvestem engaging the stem of the fuel supply Valve for transmitting opening movement of the former to the latter, and means on said air valve stem for-adjusting the posifor said housing, a normally automatically closed fluid pressure actuated'yalve controllingsaid port and having a stem proj eef:- ing from said housing,a cam-member on thestem of said last-named valve engaging the stem of the first-named valve for transmitting opening movement rof the former to the latter, and means on the auxiliary airf valve stem for adjusting said cam to vary the throw of the fuel supply valve.

11. In a constant level carbureter, a cara bursting passage having a constantly open air inlet, a fuel nozzle in said oarbureting passage, and a needle valve for said fuel nozzle, a mixing chamber into which said earbureting passage discharges, a secondary air passage opening into said mixing chamber and a suction controlled puppet valve for said secondary air passage, the stems of said puppet valve and said needle valve moving V in intersecting lines, two coperating members Consisting of a earn and afollower,

one being connected to the secondary air valve stem and the other carried by the needle valve stem whereby the needle valve 'is operated proportionately to. the opening of the secondary air valve.

WELLINGTON W. MUIR.

Witnesses:`

Gao., S. LIVINGSTON, L. A., STANLEY. 

